diff --git a/src/utility/settings.cpp b/src/utility/settings.cpp
index 1a03cc98d..e22e72eaa 100644
--- a/src/utility/settings.cpp
+++ b/src/utility/settings.cpp
@@ -143,6 +143,7 @@ void Settings::initDescriptions()
 		("test-prctl", bpo::value<std::string>(), "name of prctl file")
 		("trafile", bpo::value<std::string>()->required(), "name of the .tra file")
 		("labfile", bpo::value<std::string>()->required(), "name of the .lab file")
+		("matrixlib", bpo::value<std::string>()->default_value("gmm++"), "name of the matrix library")
 	;
 }